Tidy up README and remove IDE specifics and point to docs

[lukehinds]

We have a lot of real estate covering setting up continue (big image), instead we should be sending folks to @danbarr 's tasty docs 🍔 where these sort of needs are covered in detail.

[lukehinds]

Hey @Kashishvarmaa , that would be awesome thanks 🙏

[lukehinds]

@Kashishvarmaa when doing your edit, do could you add a pointer to Discussions please:

## Join the Conversation on GitHub Discussions 🎉

Have questions, ideas, or feedback about our project? Head over to our [GitHub Discussions](https://github.com/stacklok/codegate/discussions)! It's the perfect place to:

- 💡 Share and discuss feature ideas
- 🛠️ Get help or ask questions about the project
- 📚 Learn more about how to use and contribute to the CodeGate
- 🤝 Connect with other contributors and maintainers

We're excited to hear your thoughts and collaborate with you to make CodeGate even better!

This can go between "Introductions" and "Experimental"

[lukehinds]

@dashtangui assigned and moved to in-progress.

[dashtangui]

Closed by #822